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Alkylate Standard on Rtx-DHA 50 by Method D5134-13

GC_PC1319
PeaksKovats RI @ 35 °CD5134-13 RI ComparisonLinear RID5134-13 RI Comparison
1.Isobutane--367.3----
2.n-Butane400.0400.0----
3.Isopentane475.0475.0----
4.n-Pentane500.0500.0----
5.2,3-Dimethylbutane565.4565.5----
6.2-Methylpentane569.2569.5----
7.3-Methylpentane583.1583.4----
8.2,4-Dimethylpentane629.9630.3----
9.2,2,3-Trimethylbutane635.1635.4----
10.2-Methylhexane667.2667.8----
11.2,3-Dimethylpentane668.6669.1----
12.3-Methylhexane675.5676.2----
13.2,2,4-Trimethylpentane689.9688.7----
14.2,2,3-Trimethylpentane/2,5-dimethylhexane731.5*731.9----
15.2,4-Dimethylhexane733.2*733.5----
16.2,3,4-Trimethylpentane747.1*747.8----
PeaksKovats RI @ 35 °CD5134-13 RI ComparisonLinear RID5134-13 RI Comparison
17.2,3,3-Trimethylpentane750.0*751.1730.4*730.2
18.2,3-Dimethylhexane----744.4*743.6
19.2-Methylheptane----754.0*754.1
20.4-Methylheptane/3,4-dimethylhexane (isomer)----756.3*756.0
21.3,4-Dimethylhexane (isomer)----763.6*763.4
22.3-Methylheptane----754.0*754.1
23.2,2,5-Trimethylhexane----779.7*778.8
24.2,2,4-Trimethylhexane----786.4*785.1
25.2,4,4-Trimethylhexane----805.4805.7
26.2,3,5-Trimethylhexane----817.4817.7
27.2,4-Dimethylheptane----826.1826.6
28.2,6-Dimethylheptane----833.4833.8
29.2,5-Dimethylheptane----839.9840.3
30.2,3,4-Trimethylhexane----849.7--
31.2,3-Dimethylheptane----860.0860.4
32.2,4,6-Trimethylheptane----878.6--
*Extrapolated from n-C6 and n-C7 or from n-C8 and n-C9
ColumnRtx-DHA-50, 50 m, 0.20 mm ID, 0.50 µm (cat.# 10147)
SampleASTM D5134 qualitative reference alkylate standard (DCG Partnership I, LTD)
Injection
Inj. Vol.:0.2 µL split (split ratio 200:1)
Liner:Premium 4.0 mm ID Precision inlet liner w/ wool (cat.# 23305.5)
Inj. Temp.:200 °C
Oven
Oven Temp.:35 °C (hold 30 min) to 200 °C at 2 °C/min
Carrier GasHe, constant pressure
Linear Velocity:23 cm/sec
DetectorFID @ 250 °C
Make-up Gas Flow Rate:30 mL/min
Make-up Gas Type:N2
Hydrogen flow:40 mL/min
Air flow:370 mL/min
InstrumentAgilent 7890B GC
NotesUnderstanding the hydrocarbon components in petroleum samples is useful for sample characterization, determining product quality, planning and modeling of refinery processes, and also for regulatory purposes. ASTM D5134-13 provides the composition of paraffin, naphthenes, and monoaromatic compounds up to n-C9 in petroleum naphthas, reformates, and alkalytes.
This method is run using a long, narrow-bore column, which has a limited sample loading capacity. Therefore, high split is used and a small sample volume is injected. Restek’s Rtx-DHA-50 column is a good match for this analysis; retention index (RI) data are in agreement with the RI data provided in the method.